diff --git a/src/main/java/com/github/imas/rdflint/LintProblemFormatter.java b/src/main/java/com/github/imas/rdflint/LintProblemFormatter.java
index 42612f9..5cd8818 100644
--- a/src/main/java/com/github/imas/rdflint/LintProblemFormatter.java
+++ b/src/main/java/com/github/imas/rdflint/LintProblemFormatter.java
@@ -1,5 +1,6 @@
 package com.github.imas.rdflint;
 
+import com.github.imas.rdflint.LintProblem.ErrorLevel;
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import java.io.OutputStream;
 import java.io.PrintWriter;
@@ -78,6 +79,42 @@ public static void out(OutputStream out, LintProblemSet problems) {
     pw.flush();
   }
 
+  /**
+   * dump formatted problems.
+   */
+  @SuppressFBWarnings(value = "DM_DEFAULT_ENCODING")
+  public static void annotationGitHubAction(OutputStream out, LintProblemSet problems) {
+    PrintWriter pw = new PrintWriter(out);
+    problems.getProblemSet().forEach((f, l) -> {
+      l.forEach(m -> {
+        Object[] args = LintProblemFormatter.buildArguments(m);
+        String msg = LintProblemFormatter.dumpMessage(m.getKey(), null, args);
+        long lineNoBegin = 1;
+        long lineNoEnd = 1;
+        if (m.getLocation() != null && m.getLocation().getBeginLine() >= 0) {
+          lineNoBegin = m.getLocation().getBeginLine();
+          if (m.getLocation().getEndLine() >= 0) {
+            lineNoEnd = m.getLocation().getEndLine();
+          } else {
+            lineNoEnd = lineNoBegin;
+          }
+        }
+        pw.println(String.format(
+            "::%s file=%s,line=%d,endLine=%d,title=%s#L%d::%s",
+            m.getLevel() == ErrorLevel.INFO ? "warning" : "error",
+            f,
+            lineNoBegin,
+            lineNoEnd,
+            f,
+            lineNoBegin,
+            msg
+        ));
+      });
+      pw.println();
+    });
+    pw.flush();
+  }
+
   /**
    * dump yaml-formatted problems.
    */
diff --git a/src/main/java/com/github/imas/rdflint/RdfLint.java b/src/main/java/com/github/imas/rdflint/RdfLint.java
index fa214b7..f6e886e 100644
--- a/src/main/java/com/github/imas/rdflint/RdfLint.java
+++ b/src/main/java/com/github/imas/rdflint/RdfLint.java
@@ -109,6 +109,9 @@ public static void main(String[] args) throws ParseException, IOException {
       if (problems.hasProblem()) {
         Path problemsPath = Paths.get(params.getOutputDir() + "/rdflint-problems.yml");
         LintProblemFormatter.out(System.out, problems);
+        if ("true".equals(System.getenv("GITHUB_ACTIONS"))) {
+          LintProblemFormatter.annotationGitHubAction(System.out, problems);
+        }
         LintProblemFormatter.yaml(Files.newOutputStream(problemsPath), problems);
         final String minErrorLevel = cmd.getOptionValue("minErrorLevel", "WARN");
         final LintProblem.ErrorLevel errorLevel = LintProblem.ErrorLevel.valueOf(minErrorLevel);